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Capacity-based compressed mode control method for inter-system handover in universal mobile telecommunication system

a technology of compressed mode and universal mobile telecommunications, applied in the direction of network traffic/resource management, electrical equipment, wireless commuication services, etc., can solve the problems of reducing capacity on the contrary, system performance affected, and not having enough time and space for dispatching, so as to improve system performance, maintain system capacity, and reduce power consumption

Inactive Publication Date: 2007-11-08
NAT CHIAO TUNG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0006]The object of the present invention is to provide a capacity-based compressed mode control method, which could be applied in the inter-system handover in the Universal Mobile Telecommunication System (UMTS), and provide the advantages of reduced power consumption, improved system performance, and keeping system capacity.
[0009]Because the present invention employs the priority of the subscriber to determine whether to execute the compressed mode structure, it could keep the system capacity, reduce the power consumption, and improve the system performance.

Problems solved by technology

In order to achieve higher transmission speed and power-less control between transmission intervals, the system must increase the transmission power for the up-link and the down-link, so as to assure the connection quality, however, reduce the capacity on the contrary.
Although the compressed mode could help the inter-system handover, some of the system performance will be affected, which is caused by eliminating the power control during the voltage frame.
But, it did not have enough remaining time and space for dispatching when dealing with more transmission intervals.
This is the main reason for power consumption.

Method used

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Embodiment Construction

[0012]The objects, features, advantages and others of the present invention will become more apparent from the following detailed description in which reference is made to some embodiments of the invention and the appended drawings:

[0013]The Received Signal Code Power (RSCP) is used for the handover between boundary unit systems and as a tool for triggering measurement. The decay speed of RSCP will approach to be linear, and, with this linear relationship, the RSCP ratio (RRSCP) represents the distance required by the compressed mode. The definition of RRSCP could be represented by the formula (1) as follows:

RRSCP=Tstop-RSCPTstop-Tho(1)

wherein, Tstop is the threshold value for stopping the compressed mode; Tho is the threshold value for triggering the handover boundary cell; and, RSCP is the receiving signal encoding power value.

[0014]FIG. 1 is a diagram showing the relation of RRSCP and distance in an embodiment according to the present invention. RRSCP is used to estimate the part...

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Abstract

The Inter-System handover is one of the key features in the third generation cellular systems. The compressed mode, with variable transmission gaps and power levels, is standardized to support the inter-frequency system handover. To minimize the use of system resources while maintaining the border-cell handover quality, a capacity-based compressed mode control method of the present invention is proposed. Considering the tradeoff between the capacity and the communication quality, the control method can adaptively manage the compressed mode operation based on the potential impacts on the capacity and the effectiveness of the compressed mode measurement. The present invention will improve the effectiveness and performance of the compressed mode operation.

Description

TECHNICAL FIELD[0001]The present invention relates to a capacity-based compressed mode control method for inter-system handover in the Universal Mobile Telecommunication System (UMTS).BACKGROUND OF THE INVENTION[0002]In order to support more applications and higher transmission speed, the third generation cellular system is now rapidly and broadly developing. For making the Universal Mobile Telecommunication System (UMTS) of global mobile communication system achieving seamless connection, it will normally employ the compressed mode to handle the inter-system handover to the Global System for Mobile Communication (GSM) or the Wireless Local Area Network (WLAN).[0003]In the compressed mode, it will interrupt the current connection, so as to measure the carrier wave of other systems. For the mobile communication in UMTS, it is first required for measuring the strength of carrier wave of other systems between the transmission intervals; then, the mobile communication user could obtain ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04Q7/00H04W28/06H04W36/14
CPCH04W36/0088
Inventor HUANG, CHING YAOCHANG, CHENG TAHO, CHIEH YUAN
Owner NAT CHIAO TUNG UNIV
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